Lewisville Lk, TX — storage

Storage now, against this reservoir's own record

789.32 Mm³

Stored, June 2001

76th

Percentile among 47 Juns on record

+84.4%

Change over the 12 months to 2001-06

Storage in June 2001 was higher than most Juns on record, ranked against 47 other Juns held for this reservoir.

No percentage departure from the Jun average is published here. No long-term average is held for this month, so there is nothing to compare with.

Storage, 1954–2001

Monthly mean storage

560 monthly values, 1954 to 2001

Monthly means of the publisher's daily record. Volume, not percentage of capacity — see below for why.

What the shaded periods are (0 events)

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

240 of 560 periods, evenly spaced across the record. Every value is in the download and the API; a table of all 560 would be longer than this page and unusable with a screen reader.
Period	Lewisville Lk Nr Lewisville, TX (Mm³)
November 1954	0.855
January 1955	1.44
April 1955	16.0
June 1955	33.4
August 1955	38.8
November 1955	38.7
January 1956	38.2
March 1956	39.4
June 1956	17.9
August 1956	1.98
October 1956	2.78
January 1957	4.73
March 1957	15.1
May 1957	876
August 1957	534
October 1957	593
December 1957	597
March 1958	590
May 1958	975
July 1958	596
October 1958	526
December 1958	505
February 1959	491
May 1959	465
July 1959	525
September 1959	494
December 1959	600
February 1960	595
April 1960	589
July 1960	571
September 1960	562
December 1960	524
February 1961	595
April 1961	589
July 1961	557
September 1961	500
November 1961	486
February 1962	485
April 1962	496
June 1962	588
September 1962	801
November 1962	602
January 1963	589
April 1963	562
June 1963	584
August 1963	518
November 1963	418
January 1964	389
March 1964	391
June 1964	514
August 1964	437
October 1964	576
January 1965	583
March 1965	571
May 1965	588
August 1965	515
October 1965	552
December 1965	527
March 1966	573
May 1966	1,119
July 1966	626
October 1966	560
December 1966	525
February 1967	511
May 1967	533
July 1967	546
September 1967	483
December 1967	453
February 1968	500
April 1968	626
July 1968	571
September 1968	524
November 1968	531
February 1969	605
April 1969	592
June 1969	685
September 1969	459
November 1969	453
January 1970	509
April 1970	622
June 1970	586
August 1970	485
November 1970	557
January 1971	534
March 1971	511
June 1971	460
August 1971	432
October 1971	532
January 1972	648
March 1972	561
June 1972	527
August 1972	453
October 1972	424
January 1973	527
March 1973	600
May 1973	657
August 1973	593
October 1973	637
December 1973	594
March 1974	573
May 1974	593
July 1974	560
October 1974	595
December 1974	704
February 1975	688
May 1975	591
July 1975	568
September 1975	524
December 1975	459
February 1976	431
April 1976	433
July 1976	558
September 1976	493
November 1976	460
February 1977	518
April 1977	825
June 1977	539
September 1977	472
November 1977	422
January 1978	394
April 1978	431
June 1978	449
August 1978	373
November 1978	303
January 1979	300
March 1979	381
June 1979	576
August 1979	507
October 1979	449
January 1980	414
March 1980	403
May 1980	373
August 1980	271
October 1980	309
December 1980	330
March 1981	376
May 1981	442
July 1981	580
October 1981	1,001
December 1981	934
February 1982	648
May 1982	1,036
July 1982	1,148
September 1982	592
December 1982	540
February 1983	582
April 1983	568
July 1983	545
September 1983	475
November 1983	497
February 1984	469
April 1984	541
July 1984	465
September 1984	389
November 1984	400
February 1985	554
April 1985	653
June 1985	591
September 1985	465
November 1985	564
January 1986	555
April 1986	588
June 1986	769
August 1986	550
November 1986	564
January 1987	594
March 1987	708
June 1987	665
August 1987	546
October 1987	491
January 1988	560
March 1988	539
May 1988	494
August 1988	424
October 1988	394
December 1988	386
March 1989	579
May 1989	743
July 1989	1,019
October 1989	773
December 1989	718
February 1990	778
May 1990	1,323
July 1990	934
September 1990	774
December 1990	730
February 1991	741
April 1991	740
July 1991	758
September 1991	710
November 1991	821
February 1992	945
April 1992	802
June 1992	796
September 1992	760
November 1992	745
January 1993	802
April 1993	795
June 1993	806
August 1993	770
November 1993	801
January 1994	795
March 1994	796
June 1994	796
August 1994	787
October 1994	815
January 1995	802
March 1995	834
May 1995	852
August 1995	744
October 1995	672
January 1996	619
March 1996	578
May 1996	543
August 1996	471
October 1996	452
December 1996	794
March 1997	937
May 1997	830
July 1997	787
October 1997	682
December 1997	692
February 1998	805
May 1998	790
July 1998	694
September 1998	577
December 1998	566
February 1999	562
April 1999	554
July 1999	560
September 1999	459
November 1999	407
February 2000	401
April 2000	427
June 2000	428
September 2000	392
November 2000	429
January 2001	564
April 2001	859
June 2001	789

Why this page shows a volume and not a percentage

Percentage full is a division, and the denominator is missing

“Percentage full” is the figure a drought is discussed in, and it is stored volume divided by capacity. Capacity is published on several different bases — gross, usable, live, and the figure at a particular spillway or licence condition — and dividing a stored volume by the wrong one produces a percentage confidently wrong by the ratio between them, at exactly the moment the number matters most.

Hydrionis holds storage measurements for this reservoir and does not hold a compatible authoritative capacity figure for it, so percentage full is not calculated. The volume above is what was actually measured. Where you need a percentage, take the publisher’s own capacity on its own stated basis and divide it yourself — the source is linked below, and knowing which basis you used is the whole point.

Rate and persistence

+30.11 Mm³

Mean change per month over 12 months

13 of 24

Recent months below the 20th percentile for their own month

Rates are computed only across an unbroken run of months, so a rate is never divided by a period in which some of the change was not observed. Percentile counts compare each month with the same calendar month in every other year held.

Location

Lewisville Lk Nr Lewisville, TX

Gauge location

About this data

Everything below is a property of the data rather than a rating of it. There is deliberately no single confidence score: how much a gap matters depends on what you are about to do with the series, and only you know that.

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Measured
Period held	1954–2001
Completeness	97.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	Storage is a managed quantity. A falling line can be a rule curve, a scheduled release or a transfer to another system rather than a shortage of water, and nothing here distinguishes them. No capacity figure on a stated basis is held for this reservoir, so no percentage of capacity is computed.
Continuity	97% of the months between 1954 and 2001 are held. Monthly means of the publisher's own daily record.
Last read from the publisher	2026-10-01
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

Use this data

Machine-readable JSON /api/v1/observations/by-subject/reservoir-usgs-08052800.json
How to cite this, and who you must credit
How these figures were produced
Request this at a different scale, format or geography

No bulk download is offered here, which is a licence position rather than a product one: at least one contributing publisher does not permit redistribution. The values can be read on the page, cited, and pointed to at source.

Attribution and citation

Suggested citation for Hydrionis

Hydrionis (2026), Lewisville Lk Nr Lewisville, TX reservoir records, accessed 2026-10-05, hydrionis.com/reservoirs/reservoir-usgs-08052800/

Cite Hydrionis where you rely on the compilation, the normalisation, the eligibility judgements or a chart. Where you use an unmodified published value, the publisher’s attribution is the one that is required; crediting Hydrionis as well is welcome and is not something Hydrionis can require of you.

Recommended, not required. Hydrionis does not claim rights over unmodified public data it relayed, and doing arithmetic on somebody else’s measurements does not make them Hydrionis’s. Cite the version and the access date: the Lewisville Lk Nr Lewisville, TX record changes as publishers release and as methods are revised, and a citation without both cannot be checked later. Full guidance is on cite and reuse.

None of the contributing licences requires attribution. Crediting the publishers is still good practice and they are listed above.

Where this comes from

560 monthly observations 1954–2001 Mm³

Spatially aggregatedHigh confidenceJune 2001

Source: USGS — National Water Information System, 08052800. Licence: Open.

Method: Monthly mean of daily reservoir storage published by the USGS in acre-feet and converted to millions of cubic metres. Months with fewer than 20 days of record are not published rather than averaged from a partial month.

Reservoir storage is managed as well as observed: a drawdown may reflect an operating rule, flood-control rule curve or scheduled release rather than a shortage. Compare a month against the same month in other years, and do not read a fall as a supply signal without knowing the operating regime.

Retrieved 1 October 2026.

Monthly mean of daily reservoir storage published by the USGS in acre-feet and converted to millions of cubic metres. Months with fewer than 20 days of record are not published rather than averaged from a partial month.